Hotel Tassel is a historic building located in Brussels, Belgium. Designed by the architect Victor Horta, it is considered one of the first examples of Art Nouveau architecture. Completed in 1893, the hotel showcases innovative design elements, including curved lines and organic forms, which were revolutionary for its time. The building is recognized for its intricate interior details, such as stained glass and wrought iron. Hotel Tassel was designated a UNESCO World Heritage site in 2000, highlighting its significance in the development of modern architecture and its influence on subsequent design movements.